<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
	</body>
</html>
<script type="text/javascript">
	const arr = [1,23,343,434,659];
	const num = arr.find((n)=> {
		// 查找的条件
		return n >4;
	})
	console.log(num);
	
	console.log(arr.includes(343));
</script>
